I don't really remember how I got into the subject myself (was surfing the net like usual). It is thanks to Rosel-D and tdarnell that I got really interested in space. Here is a list of youtube videos I found to be very fascinating:

1. If Planets were Earth\'s MoonRenamed it since actual title is really long. Name is self explanatory. This is merely comparing the sizes of the planets.
2. Star Size ComparisonOur sun vs other stars. Video is somewhat outdated since the largest star observed so far is NML Cygni.
3. The Hubble Deep FieldTitle is cut short, the rest is "The Most Important Image Ever Taken". Mind blowing video (at least to me). Big numbers. Very big numbers.
4. A Journey into a Black HoleVery creepy theory/thought to think about.
5. Life in the UniversePart 2, "Where is Everybody?". Theories about habitable planets and civilizations in other parts of the universe.